Automotive Service Modern Auto Tech Study Guide Chapter

Automotive Service Modern Auto Tech Study Guide Chapter 57 Pages 1083 -1109 Automatic Transmissions 17 Points

Automotive Service 1. An automatic transmission senses engine _____ and engine ____ to determine shift points. Speed, Load Torque, Speed Load, Vacuum

Automotive Service 2. Internal hydraulic pressure is used to _______ gears. A PCM can also be used to sense conditions and actuate hydraulic pressure to control shift points inside of an automatic transmission (AT). Shift Cancel Delete

Automotive Service Bands TQC P u m p Clutches Planetary Gear Sets Governor Valve Body PCM & Shift Solenoids Vacuum Modulator or Throttle Valve

Automotive Service 3. Automatic transmissions use _____, _______ & _____ as methods to transmit power. Fluids, Friction Gears Fluids, Blood, Skin Fluids, Friars, Gears

Automotive Service 4. The main external parts that make up an AT are the _______ housing, transmission ____, oil _____, and the extension housing at the rear. Bell, Case, Pan Dell, Case, Pan Well, Case, Pan

Automotive Service 5. The __________________ is a fluid clutch that is the means of coupling and uncoupling the engine from the transmission. ATF is the fluid used inside the transmission. It’s color is red. Flex Plate Torque Converter Harmonic Balancer

Automotive Service 6. Besides the housing, a converter is made up of the _________ or pump (input), the _____, which is the driven or output member, and the stator, which is designed to improve oil circulation inside. Impeller, Compressor Impeller, Turbine Propeller, Turbine

Automotive Service 7. The __________ connects the crankshaft to the torque converter & holds the starter ring gear. Fly Wheel Flex Plate VIN Plate

Automotive Service 8. A ______ torque converter improves fuel economy (mpg) by directly connecting the engine to the input shaft of the transmission. PCM-actuated, it takes away lost motion from inside the torque converter. Lockup Backup Wrapup

Automotive Service 9. An AT has an _____ shaft or turbine shaft and an ______ shaft on the same axis or centerline. Input, Output Input, Turbine Turbo, Output

Automotive Service 10. Automatic transmissions use _________ gear sets, consisting of a sun gear, planetary pinions in a carrier and an internal ring gear. Reductions, directs, overdrives, reverse, & neutral are all possible! Helical Hypoid Planetary

Automotive Service 11. Wet, multi-disc _________ and _____ are the friction devices used to drive and lock planetary gear set components in order to achieve different gear ratios and directions of rotation. Clutches, Flywheels Clutches, Bands Clutches, Torringtons

Automotive Service 11. Wet, multi-disc _________ and _____ are the friction devices used to drive and lock planetary gear set components in order to achieve different gear ratios and directions of rotation. Clutches, Flywheels Clutches, Bands Clutches, Torringtons

Automotive Service 12. Clutches are applied by fluid pressure and released by ________ are actuated by hydraulic servos, which are a form of “apply pistons”. Springs, Bands Springs, Discs Springs, Drums

Automotive Service 13. Bands are steel ______ with linings of friction materials. They clamp around clutch drums to stop rotation. Bands are often adjustable, sometimes even from the outside of the transmission case. Straps Belts Springs

Automotive Service 14. One-way roller or sprag clutches are often called _______ clutches. They can hold in one direction and allow components to spin freely in the other direction. They operate instantly without fluid pressure. Underrunning Overrunning Marathonning

Automotive Service 15. Transmission _______ are needed because of the tremendous heat developed in the converter. Heaters Inverters Coolers

Automotive Service 16. The transmission _____ generates the fluid flow needed to develop pressure to apply hydraulic components and the fluid flow for lubrication. Pump Sump Dump

Automotive Service 17. The manual valve is operated by the action of the ______ selecting gears. The ________ modulator valve senses engine load and the ________ valve senses vehicle speed. Both are used to determine shift points. The kick down valve is used to downshift for fast acceleration (passing gear).

Automotive Service

Automotive Service

Automotive Service

Automotive Service CVT Continuously Variable Transmission

Automotive Service

Automotive Service

Automotive Service The easiest way to remember which mode a planetary gearset is in is to look at the planetary carrier. Carrier drives = overdrive Carrier driven = reduction Carrier held = reverse Two members held = direct drive Nothing driven or held = neutral Parking Pawl engaged to the output shaft = park

Links • • • Automatic Trans Animation Fiesta Power-Shift Fluid Coupling (Army) Benz Power-Flow Parts / Rebuild